Magneto-generator



R. VARLEY.

MAGNETO GENERATOR.

APPLICATION man APR. 2s. |919 Patented Mar. 2,1926;

3 SHEETS-SHEET I..

INVENTOR fizz- A2M A7 M AJ R. VARLEY.

MAGNETO GENERATOR.

APPLICATION FILED APR; 26. 1919.-

Patented Miu'. 2, 1920.

3 SHEEIS-SHEET 2.

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R. VAHLEY.

MAGNETO GENERATOR.

APPLlcAloN FILED APR.26. 1919.

Patelltd Mal.- 2, 1920.

a wins-SHEET 3 RICHARD VARLEY, OF ENGLEWOOD, NEW JERSEY.

MAGNETO-GENERATOR.

Application ied April 26, 1919.

To all whom t may concern:

Be it known that I, RICHARD VARLEY) a citizen of the United States of America, residing at Englewood, in the county of Bergen and State of New Jersey, have invented new and useful Improvements in Magneto-Generators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form part thereof.

This invention relates to ignition systems and is particularly concerned with the magneto generators thereof and more especially to that form known as the shiftable field pole type. An object is to provide means for accurately shifting to and properly retaining the field poles in the various positions necessary for obtaining the most effective co-action of the magneto with the internal combustion engine with which it is used, as is well understood to be a necessity by those skilled in this art.

Another object of the invention is the production of a structure in which the manually operated means for shifting the field poles will be relieved of the shocks resulting from the entrance of the armature poles into the substantial part of the magnetic field existing between the field poles.

Other objects and advantages will appear from the description of the invention which will be particularly pointed out in the appended claims.

In thev description reference is had to the accompanying drawings wherein I have illustrated a preferred embodiment of my invention, and wherein like characters of reference designate corresponding parts throughout the several views, and in which:

Figure 1 is a fragmentary diagrammatic end view of a magneto showing the field poles in the position of full retardation; Fig. 2 is a view corresponding to Fig. 1, but with the ield poles in a 15o advance position; Fig. 3 is a view corresponding to Fig. 1, but with the field poles in a 30 advance or full advance position; Fig. 4 is a fragmentary diagrammatic view of a modiiied form of my invention in which an inertia weight is employed; and Fig. 5 is a fragmentary view of the device shown in Fig. 4 viewed from the right hand side of Fig. 4.

I will irst describe the construction and operation of the form of my invention illustrated by Figs. 1 to 3 inclusive.

The letter A indicates a suitable sup- Specication of Letters Patent.

Patented Mar. 2, 1920. Serial No. 292,916.

porting end plate or frame of a magneto. The poles 2 and and 3 each bear a pole piece as 4 and 5, either integral or suitably attached, which pole pieces, as is understood, are each formed with a curved face whose arc is generated by the end of a radius from the center of the magneto armature 6. The numerals 7 and 8 indicate the shiftable pole pieces which are employed to vary the point in the armature travel at which the armature will cut the maximum number of magnetic lines of force between the pole pieces. These pole pieces, as is-weil understood, are formed of magnetic material such as iron and are in form segments of an annulus as shown7 the outer faces having a curvature corresponding with the inner faces of the pole pieces 4 and 5 and of approximately the same radius and the inner faces having a similar curvature but of a slightly less radius, in fact of such radius that the outer surface of the armature 6 when revolved just escapes touching them. These shiftable pole pieces are fastened in any suitable manner to a circular plate 9, rotatively mounted upon or about the armature shaft 10.

The circular end plate 9 is spring actuated, in the positions shown in the view, in a clockwise direction. This is accomplished in the preferred form shown, by means of a spring fixed at one end at 13 and at the other end fastened to the plate 9 at 11. The result of this construction is that the plate 9 carrying the shiftable pole pieces 7 and 8 when free is always moved to the extreme of its motion in a clockwise direction.

As is well understood by those skilled in the art of auto vehicles and magneto ignition, a. magneto is frequently controlled by a hand lever positioned on the steering wheel of the vehicle and connected suitably to the magneto by a rod or like member. Such a rod is illustrated in the views by the numeral 14 which is suitably connected to a segment plate 15, as by a terminal and screw as shown.

The segment plate 15 is revolubly mounted on a hub 16 of the circular plate 9, consequently an up and downimovement of rod 14 causes a rotative motion of segment plate 15 about the axis of the armature 6. The plate 15 is formed with a cut away portion 17 within which is positioned a small gear wheel 18 which meshes with gear teeth formed on the upper surface of the cut away portion. If, therefore, the segment has rigidly mounted thereon the plural faced cam 20, so that a rotation of gear WheellS causes a rotation of cam 20.

The plural faced cam 2O has a plurality of faces designated O, 1, 2, 3,4, 5', 6, 7,

8', 10', 11, 12 although l do not intend by showing the specified number of: cam faces to limit myself to that exact number. The faces of the cam are so positioned that they coact with an. abutment 21, fastened as by screws or rivets. 22f to the circular. shiftable pole pieces carrying plate 9.

With all parts as shown in. Fig. 1, the shiftable pole pieces are in the position of maximum retardation or full' retard as indicatedby the angular values shown just above the cam. Tt is to be understood that the positionl of the parts shown may have a definite relation to the position of' the Ycrank shaftr of the-engine, as it' iswellzunderstood, and that the magnetos used for ignition systems ofv interna-l combustion. en.- gines are usually directly geared thereto so that the armature of. themagneto bears a definite relation to the different pistonk posi.- tions.

Inv the position as shownv in Fig. 1',the cam face O is in contacta with abutmentl21. This contact is maintained because the spring` 12 aotuates plate 9l and' abutment 21 in a clockwise direction andithefcam 2()v is held fromturning by segmenti plate 15.. Tt is also. to be observed that the force exerted by abutment 2li against. the. cam face 0 is directly at right angles'to the face of the abutment and the cam face. and along aY line which passes directly through the center of shaft 19.v Consequently abutment 21 exerts no turning forceon cam 20; and therefore creates` no turning movement, which has to be resisted by rod 141011 the gear 18. This is lnost important: andtherein lies one? of the features of my. invention. This is so because asis welly know-n,v the rotating armature ofv a magneto at certain points in its travel exertsv ablow (it might be called amagnetic blow) against the shiftable pole pieces. Thisshock orf blow must .be absorbed. by the means carrying the shiftable pole pieces. In priorconstructions this shock is transmitted more orlessfully, to the adjusting means illustrated; by rod 14. This is objectionable as it sets up un due Wear of the parts andftends to;misplace the movable poles. In my: construction, however, the shaft 19 presents forces-in the direction ofy armature travelv from shifting the poles and from being transmittedfto rod 14, because the forces exerted on the cam faces are directly at right angles thereto and on aY line passing'directly;I throughv the center of shaft-19;

The advantages pointed out with regard to the construction when the parts are in the positions shown by Fig. 1 also exist for every faceof the cam. Thus, in Fig. 2, the cam has been rotated to obtain spark advance of fteen degrees by an operation of the rod 14 so that the abutment 21 bears against the face. 6. In this position the line of action of the force exerted against the face G is at right anglesto the beginning of this face and passes through. the center of the shaft 19; fn.l Fig.y Bthercam has beenrotatediby anoperationofthe rod 14!so-thattheabutment 21: bears against the face 12.. In: this position (which. may be thatof full advance):y of' thirty. degrees the lineof action off the force exerted against the face 12gs also at right angles tothe beginning off thisface and. passes through the center. of the'shaftV 19. The line of action ofthe forcey exerted by abutment 21 against the cam faces is shownby the line 23 in each ofthe views of. Figs. 1, 2.' and 3 inclusive.

In Figs/..4 and 5 I show'a modified form of my invention in which a` band spring is employed` to absorbshocks due to armature blows.. Tn this form an annulus 32'is mounted so as. to be rotated virtually about theaxiszof the armature 6 bybeing held-v in the circular framewESSi.fastenedbymeans of ears 3,4.V andi screws 35.toy platefA. The annulus carries within its cut-away portion a dis-k 3G. which` just fits the annnlus 32: but

4may rotate independently thereof. To this disk 36am fastenediin anyv suitable manner theY shiftable pole pieces 7 and 8. Tn the annulus 32 are formed grooves or slots 37y and 38, in each. of which islocated a dog 39.y These dogs have slightly beveled ends whichiit-iinto one of the teeth.41 formedI in the disk 36. In order to keep theI dogs in place aband spring 42; bears against their upper ends, this band spring being retained in` any suitablemanneras` by screws 43;

By theV constructionv last; described it Will be-seen thatmotioniof the rod 14a' causes oscillation ofthe annulus32v and by. means of the spring-pressedl dogs 39-39'a motion of thediskBG and.; so of thefpole'pieces 7 and 8. However, ifa severe blow is given. to the pole piecesby the armature the disk SGtends to revolve but this motion. isresisted bythe springpressed dogs39-39 which move outwardly'against thertensionv of spring 42 suiiil ciently to absorb. the-.shock before andwithout transmitting a forcete the annulus 32 andrplacing 'a strain on. rod; 14.

The member indicated.- generally by the numeral 44 in- Fig. 5 is thensual coupling whichv is used tov driverthe shaftl25 ofl the magneto'. v

hough throughout" the.y description I have described: inventionas applied to shiftabl'e .pole pieces, itf'. is to bef understood that I do not thereby desire to exclude its application in connection with equivalent means, such for instance as those devices in which the entire poles and frame is shiftable about the magneto armature and other similar constructions.

lVhat I claim as new and desire to secure by Letters Patent of the United States is:

l. In a magneto, shiftable pole pieces, means for shifting the pole pieces, an armature and means for relieving the shifting means of armature blows on the pole pieces.

2. In a magneto, an armature, shift-able pole pieces, an operable member, means between the operable member and the shiftable pole pieces for transmitting motion from the operable member to the shiftable pole pieces, and adapted to prevent force exerted upon the shiftable pole pieces from being exerted upon the operable member.

3. In a magneto, an operable member, an oscillatable member, a cam formed with a plurality of operative faces, a shaft upon which the cam is mounted, means for driving` the cam from the oscillatable member, an abutment for contact with the faces of the cam, the abutment and the cam faces being positioned so that force exerted upon the cam by the abutment acts in a line at right angles to the face of the cam and passes through the center of said shaft, an oscillatable plate carrying said abutment, pole pieces carried by the plate and a resilient means attached to the plate constantly acting to force the abutment against a cam face.

4t. In a magneto, `an operable member, an oscillatable member movable by the operable member, pole pieces carried by the oscillatable member, a body mounted for movement and adapted to positively engage the oseillatable member whereby armature blows on the pole pieces are absorbed by the said body without being transmitted to the operable member.

5. In a magneto, an operable member, a shiftable member formed with driving means, a cam formed with a plurality of operative faces, a shaft upon which the cam is mounted, means for driving the cam from the driving mea-ns of the shiftable member, when the last mentioned member is operated by the operable member, an abutment for contact with the faces of the cam, the abutment and the cam faces being positioned s0 that a force exerted upon the cam by the abutment acts in a line at right angles to the face of the cam and passe-s through the center of said shaft, a plate carrying said abutment, pole pieces carried by the plate and means for pressing the abutment against a cam face.

6. In a magneto, -an'operable member, a shiftable member formed with driving means, a cam formed with a plurality of operative faces, a shaft upon which the cam is mounted, means for driving the cam from the driving means of the shiftable member when the last mentioned member is operated by the operable member, an abutment for contact with the faces of the cam, the abutment and the cam faces being positioned sc that a force exerted upon the cam by the abutment acts in a line at right angles to the face of the cam and passes through the center of said shaft, a plate carrying said abutr ment, pole pieces carried by the plate and means attached to the plate constantly acting to force the abutment against a cam face.

7. In a magneto, an operable member, a shiftable member formed with driving means, a cam formed with a plurality of operative faces, a shaft upon which the cam is mounted, means for driving the cam from the drivingmeans of the shiftable member when the last mentioned member is operated by the operable member, an abutment for contact with the faces of the cam, the abutment and the cam faces being positioned so that a force exerted upon the cam by the abutment acts in a line at right angles to the face of the cam and passes through the center of said shaft, a plate carrying said abut ment, pole pieces carried by the plate and a resilient means constantly acting to force the abutment against a cam face.

In testimony whereof I have hereunto set my hand.

RICHARD VARLE Y 

